diff --git a/linera-base/src/crypto.rs b/linera-base/src/crypto.rs
index 09f474318211..f6300162f520 100644
--- a/linera-base/src/crypto.rs
+++ b/linera-base/src/crypto.rs
@@ -166,7 +166,7 @@ impl Serialize for CryptoHash {
         if serializer.is_human_readable() {
             serializer.serialize_str(&self.to_string())
         } else {
-            serializer.serialize_newtype_struct("CryptoHash", &self.0)
+            serializer.serialize_newtype_struct("CryptoHash", &self.0.0)
         }
     }
 }
diff --git a/linera-chain/src/chain.rs b/linera-chain/src/chain.rs
index 99f8f2fb3ccc..0d5fa35cd0b4 100644
--- a/linera-chain/src/chain.rs
+++ b/linera-chain/src/chain.rs
@@ -148,7 +148,7 @@ static STATE_HASH_COMPUTATION_LATENCY: LazyLock<HistogramVec> = LazyLock::new(||
 });
 
 /// The BCS-serialized size of an empty `ExecutedBlock`.
-const EMPTY_EXECUTED_BLOCK_SIZE: usize = 93;
+const EMPTY_EXECUTED_BLOCK_SIZE: usize = 91;
 
 /// An origin, cursor and timestamp of a unskippable bundle in our inbox.
 #[derive(Debug, Clone, Serialize, Deserialize, async_graphql::SimpleObject)]
diff --git a/linera-chain/src/unit_tests/chain_tests.rs b/linera-chain/src/unit_tests/chain_tests.rs
index 9752e25fdfb8..c504e11a47ea 100644
--- a/linera-chain/src/unit_tests/chain_tests.rs
+++ b/linera-chain/src/unit_tests/chain_tests.rs
@@ -112,7 +112,7 @@ async fn test_block_size_limit() {
     let mut chain = ChainStateView::new(chain_id).await;
 
     // The size of the executed valid block below.
-    let maximum_executed_block_size = 713;
+    let maximum_executed_block_size = 707;
 
     // Initialize the chain.
     let mut config = make_open_chain_config();